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粉末冶金材料科学与工程 >

2024 , Vol. 29 >Issue 2: 101 - 108

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2024003

工艺技术

Sc和Zr的复合添加对高Zn含量7xxx系铝合金组织演变和力学性能的影响

  • 张晓强 ,
  • 王峰 ,
  • 何骏阳 ,
  • 顾及 ,
  • 杜勇 ,
  • 宋旼
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  • 中南大学 粉末冶金国家重点实验室,长沙 410083

收稿日期: 2024-01-08

  修回日期: 2014-03-25

  网络出版日期: 2024-05-31

基金资助

国家自然科学基金资助项目(51820105001); 湖南省研究生科研创新项目(CX20230181)

收起

Effects of Sc and Zr co-addition on structural evolution and mechanical properties of a 7xxx aluminum alloy with high Zn content

  • ZHANG Xiaoqiang ,
  • WANG Feng ,
  • HE Junyang ,
  • GU Ji ,
  • DU Yong ,
  • SONG Min
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  • State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Received date: 2024-01-08

  Revised date: 2014-03-25

  Online published: 2024-05-31

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摘要

本文采用传统铸造和热加工工艺制备复合添加Sc、Zr的高Zn含量7xxx系铝合金,通过室温拉伸实验、扫描电子显微镜、X射线衍射仪和透射电子显微镜等,研究Sc、Zr的复合添加对高Zn含量7xxx系铝合金显微组织和力学性能的影响。结果表明：设计制备的新型高Zn含量(w(Zn)=10.9%)铝合金的抗拉强度为769 MPa,伸长率为4.7%。合金中高含量的Zn有利于形成高密度的纳米η'相,实现优异的沉淀强化效果。Sc和Zr复合添加形成的初生Al3(Sc,Zr)相有助于细化凝固组织,而时效过程中析出的次生Al3(Sc,Zr)相则可以有效抑制再结晶和阻碍位错运动,二者结合实现了良好的晶界强化作用。

关键词： 高Zn含量; 7xxx系铝合金; 传统铸造; 析出; 力学性能

本文引用格式

张晓强 , 王峰 , 何骏阳 , 顾及 , 杜勇 , 宋旼 . Sc和Zr的复合添加对高Zn含量7xxx系铝合金组织演变和力学性能的影响[J]. 粉末冶金材料科学与工程, 2024 , 29(2) : 101 -108 . DOI: 10.19976/j.cnki.43-1448/TF.2024003

Abstract

High Zn content 7xxx aluminum alloy with co-addition of Sc and Zr were prepared by traditional casting and thermomechanical processing technology in this paper. The effects of co-addition of Sc and Zr on the microstructure and mechanical properties of a 7xxx aluminum alloy with high Zn content was investigated by room temperature tensile test, scanning electron microscope, X-ray diffraction, and transmission electron microscope. The results show that the tensile strength of the newly designed and fabricated high Zn content aluminum alloy (w(Zn)=10.9%) is 769 MPa, while the elongation is 4.7%. The high Zn content directly leads to the formation of high density nanoscale η' phase, generating superior precipitation hardening effect. The primary Al3(Sc,Zr) phase formed by the co-addition of Sc and Zr helps to refine the solidification structures, while the secondary Al3(Sc,Zr) phase precipitated during aging effectively inhibits recrystallization and dislocation movements. These two aspects together result in exceptional grain boundary hardening effect.

Key words： high Zn content; 7xxx aluminum alloy; traditional casting; precipitation; mechanical property

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